Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation (Details Textual)

v3.5.0.2
Note 4 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Selling, General and Administrative Expenses [Member]          
Allocated Share-based Compensation Expense $ 336,310   $ 280,526 $ 765,347 $ 844,992
Cost of Sales [Member]          
Allocated Share-based Compensation Expense $ 34,155     $ 78,311  
Minimum [Member] | Restricted Stock [Member] | Employee and Non-Employee Directors [Member] | Stock Compensation Plan 2007 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year  
Minimum [Member] | Restricted Stock [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years  
Maximum [Member] | Restricted Stock [Member] | Employee and Non-Employee Directors [Member] | Stock Compensation Plan 2007 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       10 years  
Maximum [Member] | Restricted Stock [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       5 years  
Restricted Stock [Member] | Non Employee Directors [Member] | Stock Compensation Plan 2007 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       2,712 3,705
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 14.73 $ 13.48
Restricted Stock [Member] | Outgoing Non Employee Directors [Member] | Stock Compensation Plan 2007 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       1,356  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 14.73  
Restricted Stock [Member] | Employees [Member] | Stock Compensation Plan 2007 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         10 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       259,555 3,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 17.43 $ 13.33
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       263,623  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 17.39  
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Market Price Percentage, Offering Date       85.00%  
Stock Issued During Period, Shares, Employee Stock Purchase Plans   10,352   11,966  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price   $ 11.40   $ 11.40  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 143,122     143,122  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0 0
Allocated Share-based Compensation Expense $ 370,465     $ 843,658  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 7,895,912     $ 7,895,912  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       8 years 109 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term       1 year 219 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 1,676,391     $ 1,676,391  
Proceeds from Stock Options Exercised       $ 473,651 $ 41,688
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       172,450 42,000